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1、,Digestive tract,Light C,Dark C,Taste pore,Taste bud,filiform and fungiform papillae （ HE）,circumvallated papillae（HE）,Tongue foliate papillae（HE）,Foliate papillae-taste bud （HE）,Taste pore, mucous membrane of tongue Lingual papillae: filiform, fungiform & circumvallated. Tast bud: dark C, light C &
2、 basal C.,General structure of the wall,1.mucosa: epithelium: Lamina propria: Muscularis mucosa: 2.submucosa: 3.Muscularis externa: 4.adventitia:,Esophagus （HE）,Esophagus,Esophageal gland,Esophagus,1.mucosa: Epi.: stratified squamous. Non-keratinized lamina propria: CT. muscularis mucosa: boudles of
3、 SMC.longitudinal 2.sbumucosa: esophageal glands, mucous. 3.muscularis: inner circular, outer longitudinal 4.adventitia: fibrosa.,upper1/3: skeletal M. middle: mixed. Lower1/3: smooth M.,Stomach,fundus,Stomach,mucosa: Simple columnar Epi.: surface mucous cell Lamina propria: gastric pit, gastric gla
4、nds Muscularis mucosa: inner circular, outer longitudinal. submucosa: LCT. muscularis: inner oblique, middle circular, outer longitudinal. Adventitia: serosa.,fundic glands,location：lamina propria,1.Chief C 2.Parietal C 3.Neck mucous C 4.Endocrine C 5.Stem C,compositions：,Chief cells,LM: Lower colum
5、nar; basophilic; Nucleus located in the lower parts. Secretory granules. EM: Gol , Apical of the nucleus; mit. Secretory granules, apical of cytoplasm. Function : pepsinogen,Parietal cells,LM: C large，cone-shaped or round. acidophilic. Nucleus is round ,centrical. EM Introcellular secretory canalicu
6、li & microvilli. Tubulovesicular system. Mit. are abundant. functions: Hcl & intrinsic factor.,Central lacteal,SMC,Cap.,Intestinal gland,1 absorbtive C,3 Paneth C,2 goblet C,1 striated border,4 endocrine C,5 stem C,Intestinal villi,muscularis,submucosa,folds,villi,adventitia,microvilli （striated bor
7、der）,Small intestine,mucosa: Epi.: simple columnar, absorbtive C + goblet C. Lamina propria: small intestinal gland ,central lacteal. Muscularis mucosa: inner circular, outer longitudinal. villi: the finger-like processes composed of epithelium layer and lamina propria protruding into the lumen .,su
8、bmucosa The duodenal gland, mucosa. Circular folds: mucosa&submucosa protruding into the lumen . Appears as processes. muscularis: inner circular,outer longitudinal . adventitia: serosa.,small intestinal gland,Absorbtive C Goblet C Endocrine C Stem C Paneth C LM: the base of gland. arranged in group
9、s of 3-5 cells . in the apex, coarse acidophilic granules. EM: protein-secreting cell. functions: produce lysozyme.,Large intestinal,Lamina propria,Muscularis mucosa,Epi.,Large intestinal gland （goblet C）,Mucosa of large intestine（HE）,Large intestine,mucosa: no villi ,no circular folds. Simple colum
10、nar Epi.: abundant goblet C. Lamina propria: large intestinal glands, no paneth C. Muscularis mucosa:,appendix,No villi, intestinal gland Is scanty. Lamina propria: abundant LT. Serosa,Simple Columnar Goblet C abundant,Simple columnar Striated border Goblet C,Simple columnar,Striated squamous,Epi.,v
11、illus,Gastric pit,surface,Large intestine,Small intestine,stomach,esophagus,The comparisons between mucosa of variant digestive tract （1）,Fundic gland of stomach: chief , parietal, neck mucous , endocrine, stem C. Small intestinal gland: absorbtive, goblet, paneth, endocrine, stem C. Large intestinal gland: absorbtive, goblet, endocrine, stem C.,The comparisons between mucosa of variant digestive tract （2）,Key points,Structure characteristics of variant digestive tract. The similar and the different. Esp, the variance of tunica mucosa. Such as , the villi and the glands.,Thank you !,
